The logical extension, which replaces the former expression "in your face", which is superior in that it give specific information about WHAT is in your face. It is indicated in such a way as to imply that a bold act of superiority indicates, or more precisely, is a result of, superior genitalia.

Upon dunking a basketball on someone, and in the process dragging your nuts across his face:

As the legend goes, Dr. Dre was on holiday in Kansas City, Missouri when he felt the hankering for Micky Dees (McDonalds). While he was in line for the Drive Thru, he noticed the car in front of him was taking a long time. He thought to himself, "what the fuck are these guys doin?" He listened intently. What he heard was the beginning of a grand revolution.

"Yes, I hear the McRib is back. I'd like one of those with a milk."
"Is that all, sir.."
"Yes, and please add the Deez to that order, with a milk again."
"The what??"
"The deez..."
"DEEZ???"
"DEEZ NUTZ! DEEZ NUTZ! DEEZ NUTZ!"

The hooligans sped around the corner, pointed at their "nutz" and yelled once more, "DEEZ NUTZ!"

Dr. Dre realized the genius of this prank, and incorporated it into his new album. Thus the Deez NUTZ prank was made famous. Today the DEEZ revolution has spread to every city in the world.

Driving in car...

"Hello good sir, can I ask you a question? We are looking for the Deez. Is it on 18th street?"